Need a Professional in Chattanooga?

I am adding on to a 50 year old house with a hot water loop system (but a much newer boiler), and cannot find a local profesional that wants to do the work. The company that installed the boiler lost its specialist. The three companies that have come to look at the job have all tried to convince me to switch to hot air, and have not even been able to calculate any type of bid.
Any suggestions would be appreciated. - Doug